Nagios Error: Could not find any host matching/Could not expand hostgroups and/or hosts

[Dei Bertine]

Hi there - I am getting this error when trying to verify my Nagios configs and was wondering what it means? 
I newly setup Nagios to monitor some of our Linux boxes and Windows server. 
Linux is sending alerts and monitoring fine but the Windows I have not gotten any alerts. 
Below is the error I am getting when trying to verify my configuration file.
servelord:/var/log# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
Nagios 2.10
Copyright (c) 1999-2007 (http://www.nagios.org)
Last Modified: 10-21-2007
License: GPL
Reading configuration data...
Error: Could not find any host matching 'win4503'
Error: Could not expand hostgroups and/or hosts specified in service (config file '/usr/local/nagios/etc/windows.cfg', starting on line 36)
***> One or more problems was encountered while processing the config files...
     Check your configuration file(s) to ensure that they contain valid
     directives and data defintions.  If you are upgrading from a previous
     version of Nagios, you should be aware that some variables/definitions
     may have been removed or modified in this version.  Make sure to read
     the HTML documentation regarding the config files, as well as the
     'Whats New' section to find out what has changed.

I'd appreciate any assistance with this. 

Thank you,
Dei



      
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